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(C) Upon ionization,the $Br^-$ ion leaves,generating a carbocation at the carbon atom previously bonded to the bromine.Compound $1$ is $3$-bromo$-2-$e

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$1$ and $2$

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(C) Upon ionization,the $Br^-$ ion leaves,generating a carbocation at the carbon atom previously bonded to the bromine.Compound $1$ is $3$-bromo$-2-$ethylbut$-1-$ene. Ionization gives a secondary allylic carbocation: $CH_3-CH^+-C(=CH_2)-CH_2-CH_3$.Compound $2$ is $1$-bromo$-2-$ethylbut$-2-$ene. Ionization gives a primary allylic carbocation: $CH_3-CH=C(CH_2CH_3)-CH_2^+$.These two carbocations are resonance structures of each other,meaning they represent the same delocalized allylic system.Therefore,compounds $1$ and $2$ yield the same resonance-stabilized carbocation.

Which of the following compounds gives the same carbocation on ionization?

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